/* The Twangle website (docs/architecture/website.md). Since Phase 83 in 2.0's one look, Ink (core/designsystem
   StylePalettes.kt), light or dark as the visitor's device is set; the home page opens on a dark stage with the
   logo plucked large. Nothing is loaded from another site and nothing runs (website/build.py checks).
   The text is in the app's own face, Nunito: nunito.woff2, a cut of its Latin letters with its weights
   (SIL OFL 1.1, nunito-OFL.txt beside it; docs/architecture/website.md says how it was cut). */
@font-face { font-family: Nunito; src: url("nunito.woff2") format("woff2"); font-weight: 200 1000; font-display: swap; }

/* Ink light and dark. The three harmonics of the logo are Ink's own colours: the whole string amber (far off), the
   halves blue (the accent), the thirds green (in tune). The site gives one to each group of tools. */
:root {
  --page: #F6F7F9; --surface: #FFFFFF; --ink: #14181D; --muted: #4D5560; --track: #E1E5EA; --accent: #1A6FC4;
  --amber: #A86400; --blue: #1A6FC4; --green: #107E46; /* the amber a shade deeper than the app's, for white on it */
  --soft: 0 1px 2px rgba(20, 24, 29, .05), 0 6px 24px rgba(20, 24, 29, .06);
  --lift: 0 2px 4px rgba(20, 24, 29, .06), 0 14px 36px rgba(20, 24, 29, .10);
  --ui: Nunito, Roboto, system-ui, -apple-system, "Segoe UI", sans-serif;
  /* The dark stage the logo plays on, in both themes: Ink dark, the background the logo's colours were made for. */
  --stage: #0E1116; --stage-ink: #EEF1F5; --stage-muted: #A8B0BC;
}
@media (prefers-color-scheme: dark) {
  :root {
    --page: #0E1116; --surface: #171B22; --ink: #EEF1F5; --muted: #A8B0BC; --track: #262C35; --accent: #5FC4FF;
    --amber: #FFB648; --blue: #5FC4FF; --green: #3DDC84;
    --soft: 0 0 0 1px rgba(238, 241, 245, .05); --lift: 0 0 0 1px rgba(238, 241, 245, .10), 0 14px 36px rgba(0, 0, 0, .35);
    color-scheme: dark;
  }
}
* { box-sizing: border-box; }
html { background: var(--page); }
body { margin: 0; color: var(--ink); font: 400 17px/1.65 var(--ui); overflow-x: clip; }
a { color: var(--accent); text-underline-offset: .18em; }
img { max-width: 100%; }
.wrap { max-width: 1080px; margin: 0 auto; padding: 0 24px; }

/* The harmonics as small marks: n lobes of a string, the whole, the halves, the thirds (sin(n·pi·u), as the logo),
   and all three together for the group that is a bit of everything. Masks, so each takes its group's colour. */
:root {
  --h1: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 14'%3E%3Cpath d='M1 7Q12 -4 23 7Z'/%3E%3C/svg%3E");
  --h2: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 14'%3E%3Cpath d='M1 7Q6.5 -2 12 7Q17.5 16 23 7Z'/%3E%3C/svg%3E");
  --h3: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 14'%3E%3Cpath d='M1 7Q4.67 -1 8.33 7Q12 15 15.67 7Q19.33 -1 23 7Z'/%3E%3C/svg%3E");
  --arrow: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 14'%3E%3Cpath d='M2 7h15M11.5 1.5L17 7l-5.5 5.5' fill='none' stroke='black' stroke-width='2.6' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  --hall: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 14'%3E%3Cpath fill-opacity='.45' d='M1 7Q12 -4 23 7Z'/%3E%3Cpath fill-opacity='.7' d='M1 7Q6.5 -2 12 7Q17.5 16 23 7Z'/%3E%3Cpath d='M1 7Q4.67 -1 8.33 7Q12 15 15.67 7Q19.33 -1 23 7Z'/%3E%3C/svg%3E");
}
.tuning { --g: var(--amber); --gm: var(--h1); }
.listening { --g: var(--blue); --gm: var(--h2); }
.practice { --g: var(--green); --gm: var(--h3); }
.more { --g: var(--muted); --gm: var(--hall); }
.g-tuning { --g: var(--amber); --gm: var(--h1); }
.g-listening { --g: var(--blue); --gm: var(--h2); }
.g-practice { --g: var(--green); --gm: var(--h3); }
.g-more { --g: var(--muted); --gm: var(--hall); }
.emblem::before, .group::before, .crumb::before {
  content: ""; display: inline-block; width: 2.1em; height: 1.2em; vertical-align: -.25em; margin-right: .55em;
  background: var(--g, var(--accent)); -webkit-mask: var(--gm, var(--hall)) center / contain no-repeat; mask: var(--gm, var(--hall)) center / contain no-repeat;
}

/* Top bar: the icon and name on the left, three links on the right, a language link at the end */
header .wrap { display: flex; align-items: center; gap: 18px; min-height: 68px; flex-wrap: wrap; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 600; font-size: 19px; color: var(--ink); text-decoration: none; margin-right: auto; }
/* The icon and name (Phase 79, website/twangle-icon.svg and twangle-name.svg, TwangleName.kt's proportions): the
   capitals about 15 px tall, the icon 2.5 times that, the word's capitals level with the icon's middle. */
.brand .twangle-icon { display: block; height: 38px; width: 38px; flex: none; }
.brand .twangle-name { display: block; height: 19.4px; margin-left: -2.5px; width: auto; aspect-ratio: 449.7 / 100.8; align-self: flex-start; margin-top: 11.5px; }
.skip { position: absolute; left: -9999px; }
.skip:focus { left: 16px; top: 8px; background: var(--page); padding: 6px 12px; border-radius: 8px; z-index: 3; }
nav { display: flex; gap: 22px; font-size: 16px; font-weight: 600; }
nav a { color: var(--muted); text-decoration: none; }
nav a:hover { color: var(--ink); }
nav a[aria-current] { color: var(--ink); }
.lang { font-size: 14px; font-weight: 600; color: var(--muted); background: var(--track); border-radius: 99px; padding: 3px 12px; text-decoration: none; }

main { display: block; padding: 44px 0 64px; }
h1 { font-size: clamp(32px, 5.4vw, 52px); line-height: 1.1; font-weight: 800; margin: 0 0 16px; letter-spacing: -0.02em; }
h2 { font-size: clamp(24px, 3vw, 30px); line-height: 1.25; font-weight: 800; margin: 52px 0 14px; letter-spacing: -0.01em; }
h3 { font-size: 18px; margin: 0 0 4px; }
p { margin: 0 0 14px; }
.lead { font-size: 19px; color: var(--muted); max-width: 34em; }

/* ---- Home ---------------------------------------------------------------------------------------------------- */
/* The top bar on the home page sits on the stage, dark in both themes. */
.home header .brand { visibility: hidden; } /* the banner below is the name on the home page */
.home header { background: var(--stage); --ink: var(--stage-ink); --muted: var(--stage-muted); --track: #262C35; color-scheme: dark; }
.home main { padding: 0 0 24px; }
.home section { padding: 72px 0 0; }

/* The stage: a banner of the logo and the name beside it, the logo plucked once as the page opens (the app's opening
   animation, its maths from scripts/launcher-icon.py), and again on each tap. A tap on the banner toggles a hidden
   checkbox, which switches every animation to its twin of another name, so each starts over; nothing runs. With less
   motion asked for, it stands still. */
.home .stage {
  position: relative; padding: 64px 0 88px; text-align: center; color: var(--stage-ink); overflow: clip;
  background:
    radial-gradient(60% 50% at 50% 38%, rgba(95, 196, 255, .10), transparent 70%),
    radial-gradient(40% 40% at 30% 30%, rgba(255, 182, 72, .07), transparent 70%),
    radial-gradient(40% 40% at 72% 52%, rgba(61, 220, 132, .06), transparent 70%),
    var(--stage);
  --ink: var(--stage-ink); --muted: var(--stage-muted); --accent: #5FC4FF; color-scheme: dark;
}
.stage .pluck { position: absolute; opacity: 0; pointer-events: none; width: 1px; height: 1px; }
/* The banner (owner, 2026-11-07: the logo alone was too big; with the name beside it instead), sized by the mark's
   height --h: the mark 76 by 44 units, its string 29 units down (65.9 %); the name's capitals 0.6 --h tall, standing
   on the string (its baseline at 78.1 of its 100.8 units), so the halves and the thirds dip below it as the g's tail
   does. About 5.4 --h wide in all, so it fits a 320 px phone. */
.stage .mark {
  --h: clamp(48px, 16vw, 120px);
  position: relative; display: flex; align-items: flex-start; gap: calc(var(--h) * .22); width: max-content; margin: 0 auto;
  cursor: pointer; -webkit-tap-highlight-color: transparent; user-select: none; -webkit-user-select: none;
}
.stage .twangle-hero { position: relative; z-index: 1; display: block; flex: none; height: var(--h); width: auto; aspect-ratio: 76 / 44; overflow: visible; }
.stage .twangle-name {
  position: relative; z-index: 1; display: block; flex: none; color: var(--stage-ink);
  height: calc(var(--h) * .774); width: auto; aspect-ratio: 449.7 / 100.8; margin-top: calc(var(--h) * .059);
}
/* What the pluck sends out: a soft glow under the mark's string (no rings: the owner had them taken out, 2026-11-07) */
.stage .glow {
  position: absolute; left: calc(var(--h) * .864); top: calc(var(--h) * .659); width: calc(var(--h) * 2.4); aspect-ratio: 2.2; transform: translate(-50%, -50%); pointer-events: none;
  background: radial-gradient(closest-side, rgba(255, 182, 72, .22), rgba(95, 196, 255, .12) 55%, transparent);
  animation: glow 2600ms ease-out 150ms both;
}
.stage .pluck:checked + .mark .glow { animation-name: glow-b; }
@keyframes glow { 0% { opacity: 0; } 20% { opacity: 1; } 100% { opacity: .45; } }
@keyframes glow-b { 0% { opacity: 0; } 20% { opacity: 1; } 100% { opacity: .45; } }
.stage h1 { max-width: 15em; margin: 52px auto 18px; animation: arrive 800ms ease-out 700ms both; }
.stage .lead { margin: 0 auto 26px; color: var(--stage-muted); animation: arrive 800ms ease-out 900ms both; }
.stage .play { animation: arrive 800ms ease-out 1100ms both; }
@keyframes arrive { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }

/* Google's own badge, as Google's badge rules ask: unchanged, at least 40 px high, room around it */
.play { display: inline-block; margin-top: 6px; line-height: 0; border-radius: 10px; }
.play img { height: 60px; width: auto; }

/* The four promises, each with a check in the in-tune green */
.promise { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.promise li { background: var(--surface); box-shadow: var(--soft); border-radius: 20px; padding: 20px 20px 18px; font-size: 15px; color: var(--muted); line-height: 1.5; }
.promise b { display: block; color: var(--ink); font-size: 18px; font-weight: 800; margin-bottom: 4px; }
.promise b::before {
  content: ""; display: block; width: 26px; height: 26px; border-radius: 50%; margin-bottom: 12px;
  background: var(--green) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M6.5 12.5l3.5 3.5 7.5-8' fill='none' stroke='white' stroke-width='2.6' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center / 18px no-repeat;
}

/* The tuner beside the words on what it tunes */
.showcase .wrap { display: grid; grid-template-columns: 300px 1fr; gap: 64px; align-items: center; }
.showcase h2 { margin-top: 0; }
.kicker { font-size: 14px; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); margin: 0 0 8px; }

/* A screenshot as a phone: round corners, a soft shadow, no frame */
.shot { display: block; margin: 0 auto; width: 100%; max-width: 280px; height: auto; aspect-ratio: 540 / 1157; border-radius: 30px; background: var(--surface); box-shadow: var(--lift); color: var(--muted); font-size: 14px; }

/* The tools in their groups, each group with its harmonic */
.group { font-size: 14px; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; color: var(--ink); margin: 34px 0 12px; }
.tools { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
/* A tool card is a link once the tool's page exists, a plain box until then */
.tools > * {
  position: relative; display: block; background: var(--surface); box-shadow: var(--soft); border-radius: 20px; padding: 18px 20px;
  text-decoration: none; color: var(--muted); font-size: 15px; line-height: 1.5; transition: transform .2s ease, box-shadow .2s ease;
}
.tools b { display: block; color: var(--ink); font-size: 18px; font-weight: 800; margin-bottom: 3px; }
.tools a b::after { /* an arrow of its own: Nunito's cut has none */
  content: ""; display: inline-block; width: .95em; height: .7em; margin-left: .4em; vertical-align: .02em; background: var(--g, var(--accent));
  -webkit-mask: var(--arrow) center / contain no-repeat; mask: var(--arrow) center / contain no-repeat; transition: transform .2s ease;
}
.tools a:hover b::after, .tools a:focus-visible b::after { transform: translateX(3px); }
.tools a:hover, .tools a:focus-visible { transform: translateY(-2px); box-shadow: var(--lift), inset 0 0 0 2px color-mix(in srgb, var(--g, var(--accent)) 55%, transparent); outline: none; }

/* A row of screenshots, each with a short line under it */
.shots { list-style: none; padding: 0; margin: 8px 0 0; display: grid; grid-template-columns: repeat(4, 1fr); gap: 28px; }
.shots li { margin: 0; font-size: 15px; color: var(--muted); text-align: center; line-height: 1.45; }
.shots .shot { border-radius: 24px; margin-bottom: 16px; }

/* Why I made it: the maker's own words, in a card of its own */
.story .wrap > div {
  position: relative; max-width: 780px; margin: 0 auto; background: var(--surface); box-shadow: var(--soft);
  border-radius: 28px; padding: 44px 48px 36px; overflow: hidden;
}
.story .wrap > div::before { /* the three harmonics, faint, along the card's top */
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 5px;
  background: linear-gradient(90deg, var(--amber), var(--blue) 50%, var(--green));
}
.story h2 { margin-top: 0; }
.story p { font-size: 18px; line-height: 1.7; }
.story .name-note { font-size: 16px; color: var(--muted); border-top: 1px solid var(--track); padding-top: 18px; margin-top: 24px; }

/* The end of the home page: the badge once more, on the stage */
.home .finale { margin-top: 80px; padding: 64px 0 72px; background: var(--stage); color: var(--stage-ink); text-align: center; --ink: var(--stage-ink); --muted: var(--stage-muted); --accent: #5FC4FF; color-scheme: dark; }
.finale h2 { margin: 0 0 10px; }
.finale p { color: var(--stage-muted); margin: 0 auto 22px; max-width: 30em; }
/* Home, at the end: the line about buying the maker a coffee (build.py leaves it out until the owner's page exists) */
.support { margin: 26px auto 0; max-width: 34em; font-size: 15px; }

/* ---- Tool pages ---------------------------------------------------------------------------------------------- */
/* A soft wash at the top in the group's colour, and the crumb carrying its harmonic */
body[class*="g-"] main { background: radial-gradient(70% 380px at 12% 0, color-mix(in srgb, var(--g) 11%, transparent), transparent 75%); }
.crumb { display: inline-block; font-size: 14px; font-weight: 700; color: var(--muted); background: var(--surface); box-shadow: var(--soft); border-radius: 99px; padding: 5px 14px 5px 12px; margin-bottom: 18px; }
.crumb::before { margin-right: .55em; }
.crumb a { color: var(--muted); }
.tool { display: grid; grid-template-columns: 1fr 270px; gap: 56px; align-items: start; }
.tool .shot { position: sticky; top: 24px; }
.tool.solo { grid-template-columns: 1fr; max-width: 740px; } /* a tool page without a picture */
.tool h2 { font-size: 24px; margin-top: 40px; }
.wide { display: block; width: 100%; height: auto; aspect-ratio: 960 / 448; border-radius: 22px; box-shadow: var(--lift); background: var(--surface); margin: 8px 0 0; } /* a screenshot on its side, across the column */
ol.steps { list-style: none; counter-reset: step; padding: 0; margin: 0 0 18px; }
ol.steps li { counter-increment: step; position: relative; padding-left: 44px; margin-bottom: 12px; min-height: 30px; }
ol.steps li::before {
  content: counter(step); position: absolute; left: 0; top: 0; width: 30px; height: 30px; border-radius: 50%;
  display: grid; place-items: center; font-weight: 800; font-size: 15px; color: var(--page); background: var(--g, var(--accent));
}
details { background: var(--surface); box-shadow: var(--soft); border-radius: 18px; padding: 4px 20px; margin: 0 0 10px; }
summary { cursor: pointer; font-weight: 700; padding: 13px 0; }
details > :not(summary) { margin-top: 0; }
details[open] { padding-bottom: 10px; }
.curious { background: color-mix(in srgb, var(--g, var(--accent)) 9%, var(--surface)); }
.nextprev { display: flex; justify-content: space-between; gap: 12px; margin-top: 48px; font-size: 16px; font-weight: 700; }
.nextprev a { text-decoration: none; background: var(--surface); box-shadow: var(--soft); border-radius: 99px; padding: 8px 18px; }
.nextprev a:hover { box-shadow: var(--lift); }

/* Help page */
.help { max-width: 740px; }
/* A link to help.html#octave opens that answer; its question stays in view above it. */
.help details [id] { scroll-margin-top: 4em; }
.ask { background: color-mix(in srgb, var(--accent) 10%, var(--surface)); border-radius: 18px; padding: 18px 20px; margin-top: 36px; }

footer { color: var(--muted); font-size: 15px; }
footer .wrap { display: flex; flex-wrap: wrap; gap: 8px 24px; padding-top: 26px; padding-bottom: 32px; border-top: 1px solid var(--track); }
.home footer .wrap { border-top: 0; }
footer span { margin-right: auto; }
footer small { flex-basis: 100%; font-size: 13px; }
footer a { overflow-wrap: anywhere; }

/* Less motion asked for: everything stands still, the logo in its resting pose, nothing to tap for */
@media (prefers-reduced-motion: reduce) {
  .stage .glow { display: none; }
  .stage .mark { cursor: default; }
  .stage h1, .stage .lead, .stage .play { animation: none; }
  .tools > * { transition: none; }
  .tools a:hover, .tools a:focus-visible { transform: none; }
}

@media (max-width: 860px) {
  .promise { grid-template-columns: 1fr 1fr; }
  .tools { grid-template-columns: 1fr 1fr; }
  .shots { grid-template-columns: 1fr 1fr; gap: 28px 18px; }
  .showcase .wrap { grid-template-columns: 220px 1fr; gap: 36px; }
}
@media (max-width: 720px) {
  body { font-size: 16px; }
  .wrap { padding: 0 16px; }
  main { padding-top: 28px; }
  nav { gap: 16px; }
  header .lang { display: none; } /* on a phone the language link is in the footer only */
  .home section { padding-top: 56px; }
  .home .stage { padding: 36px 0 64px; }
  .stage h1 { margin-top: 36px; }
  .lead { font-size: 18px; }
  .tool { grid-template-columns: 1fr; gap: 28px; }
  .tool .shot { position: static; max-width: 170px; order: -1; }
  .showcase .wrap { grid-template-columns: 1fr; gap: 32px; }
  .showcase .shot { max-width: 230px; }
  .tools { grid-template-columns: 1fr; }
  .promise li { padding: 16px; }
  .story .wrap > div { padding: 32px 22px 26px; border-radius: 22px; }
  .story p { font-size: 17px; }
  .play img { height: 56px; }
}